diff --git a/com.unity.ml-agents/Runtime/Academy.cs b/com.unity.ml-agents/Runtime/Academy.cs
index 82d851e72b..7375e45eb9 100644
--- a/com.unity.ml-agents/Runtime/Academy.cs
+++ b/com.unity.ml-agents/Runtime/Academy.cs
@@ -64,7 +64,7 @@ public class Academy : IDisposable
         /// Unity package version of com.unity.ml-agents.
         /// This must match the version string in package.json and is checked in a unit test.
         /// </summary>
-        internal const string k_PackageVersion = "0.15.0-preview";
+        internal const string k_PackageVersion = "0.15.1-preview";
 
         const int k_EditorTrainingPort = 5004;
 
diff --git a/com.unity.ml-agents/package.json b/com.unity.ml-agents/package.json
index 7e4b1d4e74..faf047b163 100755
--- a/com.unity.ml-agents/package.json
+++ b/com.unity.ml-agents/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.unity.ml-agents",
   "displayName": "ML Agents",
-  "version": "0.15.0-preview",
+  "version": "0.15.1-preview",
   "unity": "2018.4",
   "description": "Add interactivity to your game with Machine Learning Agents trained using Deep Reinforcement Learning.",
   "dependencies": {
diff --git a/gym-unity/gym_unity/__init__.py b/gym-unity/gym_unity/__init__.py
index 9da2f8fcca..903e77ce1b 100644
--- a/gym-unity/gym_unity/__init__.py
+++ b/gym-unity/gym_unity/__init__.py
@@ -1 +1 @@
-__version__ = "0.15.0"
+__version__ = "0.15.1"
diff --git a/ml-agents-envs/mlagents_envs/__init__.py b/ml-agents-envs/mlagents_envs/__init__.py
index 9da2f8fcca..903e77ce1b 100644
--- a/ml-agents-envs/mlagents_envs/__init__.py
+++ b/ml-agents-envs/mlagents_envs/__init__.py
@@ -1 +1 @@
-__version__ = "0.15.0"
+__version__ = "0.15.1"
diff --git a/ml-agents/mlagents/trainers/__init__.py b/ml-agents/mlagents/trainers/__init__.py
index 9da2f8fcca..903e77ce1b 100644
--- a/ml-agents/mlagents/trainers/__init__.py
+++ b/ml-agents/mlagents/trainers/__init__.py
@@ -1 +1 @@
-__version__ = "0.15.0"
+__version__ = "0.15.1"